After successful submission of the answer for some task you get to the Attempt Result page:
You see, the user is congratulated with the green word Correct (otherwise it would be red word Wrong).
Below are calculations - how many points he gained for this task (it depends on how many users already solved it - the more users - the less points - see dedicated explanation) - and how many points are collected in total - this is called the Enlightenment.
At the bottom of the page you may see author's explanations about the best approach to the task.
You also now can see other users' solutions clicking the link surrounded by the third red ellipse in the picture.
Go to Step 4 to see an example of the list of other solutions.